/* 
Scenic Graphics Library
Copyright (C) 2007 Jouni Tulkki

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USApackage scenic;
*/

package scenic.filter;

/**
 * Box filter kernel.
 */
public class BoxKernel extends SeparableKernel {
	private static BoxKernel kernel;
	
	private BoxKernel() {
	}
	
	public double getValue(double x) {
		if(x < -0.5 || x > 0.5)
			return 0.0;
		return 1.0;
	}
	
	public static BoxKernel getKernel() {
		if(kernel == null)
			kernel = new BoxKernel();
		return kernel;
	}
}
